Overnight FC loss test

Target level FC is the best indicator. You should have some undissolved particles of the powder in your sample after mixing.
 
For accuracy in the OCLT make sure you fill the 10ml exactly the same in each test. If you are 1/4ml high on the first and 1/4 ml low on the second you'll be off by 1.5 FC error right out of the gate at fc=30. 1/4 ml on those lines is not much!

Hold the bottle vertical when doing the drops. And make sure they hang for a bit before dropping. Otherwise the drop sizes can be a further source of errors affecting the repeatability of the test.
 
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